75 results about "Electron transfer rate" patented technology

The invention provides a black TiO2 nanosheet (at) Pt nanoparticle photoelectric catalyst and a preparation method and application thereof in methane photoelectric catalytic conversion, black TiO2 is prepared by introducing surface defects (such as oxygen vacancies) so as to expand the visible light response range of the black TiO2, and the surface of the black TiO2 is modified by precious metal nanoparticles (such as Pt), so that the visible light response range of the black TiO2 is expanded. While the photo-induced electron separation is promoted and the catalytic activity is improved, the overall conductivity and the interface electron transfer rate are remarkably improved. Particularly, TiO2 is constructed into an ultrathin two-dimensional nanosheet structure, so that not only can a larger specific surface area and more reaction active sites be provided, but also the diffusion path of photon-generated carriers can be shortened, and the recombination probability can be effectively reduced, thereby further enhancing the photoelectric conversion efficiency. Compared with the prior art, the catalyst provided by the invention has the advantages of ultrathin two-dimensional structure, surface defect regulation and precious metal synergistic modification, and can realize efficient visible light driven photoelectrocatalytic methane conversion.

The invention relates to sludge-based nano biochar as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing iron-containing excess sludge into a suspension, adjusting the pH value to 2-8, heating and hydrolyzing at 40-150 DEG C, collecting solids, drying and grinding to obtain sludge fine powder; calcining in an N2 atmosphere to obtain charcoal powder; the charcoal powder is subjected to acid pickling, and acidified charcoal is obtained; mixing and reacting with hydrogen peroxide in proportion, centrifuging to take supernate, and filtering to obtain a nano biochar solution; and purifying and drying the nano-biochar solution to prepare nano-biochar powder. The particle size of the nano biochar is 1t; the molar percentage content of the oxygen element is 15%-50%; the width of lattice fringes is 0.22 nm, and the total content of heavy metals is lower than 0.05%. The sludge-based nano biochar provided by the invention has good conductivity, oxidation-reduction property and low biotoxicity, and can simultaneously accelerate the extracellular electron transfer effect and intracellular electron transfer rate of microorganisms and improve the biological denitrification efficiency.

The present application relates to a kind of trace nitrogen oxide reinforced UVB / high iodate degradation flame retardant intermediate method, comprising the following steps: respectively, an appropriate amount of high iodate and ACNHTEMPO are sequentially added into DOPO containing wastewater, the pH of mixed solution is adjusted with phosphate buffer solution, after being fully stirred, UV irradiation is carried out for a period of time, the degradation of organic phosphorus flame retardant intermediate DOPO can be realized.The present application method utilizes potassium periodate under the irradiation of ultraviolet light, activates ACNHTEMPO to speed up electron transfer rate, substantially improves the degradation efficiency of pollutant, and the pH is widely applicable.Solve the defect that most advanced oxidation technology needs to be carried out in acidic conditions;In addition, the present method is simple to operate, uses trace activator, does not produce secondary pollution, can provide new perspective for organic wastewater treatment field.

The application discloses a kind of gold nanoparticle loaded oxygen-doped ultrathin porous boron nitride film electrode and preparation method thereof, the preparation method includes the following steps: according to mass ratio 1:3-6:0.25-0.35, boric acid, urea, oxalic acid is prepared oxygen-doped ultrathin porous boron nitride, then gold nanoparticle is loaded oxygen-doped ultrathin porous boron nitride and coated on conductive substrate to form film electrode.The oxygen-doped ultrathin porous boron nitride film electrode loaded with gold nanoparticles prepared by the application has the advantages of large specific surface area, high electron-hole separation efficiency, fast electron transfer rate, etc., is a new type of film electrode with excellent photoelectric performance, meets the actual production demand, and has wide application prospect in photoelectrochemical field.The preparation method also has the advantages of simple process, easy operation, high preparation efficiency and low cost, and is suitable for large-scale preparation, which is beneficial to industrial application.

The invention belongs to the technical field of underground water pollution remediation functional catalytic materials and water treatment, and particularly relates to a modified iron heterojunction biomass slow-release material, a preparation method thereof and application of a coupled electric field in underground water organic pollutant remediation. The mushroom biochar is used as a carrier to load the modified zero-valent iron, so that the problem of iron agglomeration is effectively relieved; and the modified zero-valent iron grows in the three-dimensional pore channel of the charcoal in situ, so that the slow release of the iron active component can be realized, and the utilization efficiency of the oxidizing agent is improved. An electric field is built in the iron-carbon structure reinforcing material, so that the problem of slow mass transfer in an underground water medium is solved, and the surface accessibility of an oxidizing agent and pollutants is improved. The material not only can reduce the invalid consumption of an oxidizing agent caused by overhigh local Fe < 2 + > concentration, but also can drive directional electron migration through an electric field, realizes space-time matching and dynamic regulation and control of an electron transfer rate and an iron supply rate, forms an in-situ regeneration closed-loop system, and has a good application prospect in groundwater remediation.

The invention discloses a preparation method of an MXene-based electro-polymerization molecularly imprinted polymer and application of the MXene-based electro-polymerization molecularly imprinted polymer in detection of sulfadimethoxine content. The preparation method comprises the steps of synthesis of an MXene-MOF composite material, preparation of the MXene-based electro-polymerization molecularly imprinted polymer and the like. The electrochemical detection of the SDM is realized by electrically polymerizing a layer of molecularly imprinted polymer on the surface of the MXene-based composite material. When SDM exists in a detection environment, an imprinting cavity with specific recognition capability is combined with the SDM through acting forces such as hydrogen bonds and the like, so that the electron transfer rate is hindered, and the current value is reduced. The quantitative detection of the SDM is realized by analyzing the relationship between the logarithm of the concentration of the SDM and the delta I current change value. The method has a wide concentration detection range and a low detection limit, and has a wide application prospect.

The application discloses a kind of garden plant health condition detection and early warning system based on spectral analysis, including adjustable frequency excitation light source, fluorescence detector, quadrature phase-locked demodulation module, phase frequency characteristic analysis module, early warning control unit and early warning output terminal, adjustable frequency excitation light source emits broadband sweep frequency modulation perturbation excitation light, quadrature phase-locked demodulation module executes operation filtering natural background stray light to the electric signal collected, phase frequency characteristic analysis module extracts characteristic relaxation frequency parameter when absolute phase delay parameter reaches forty-five degrees phase angle, early warning control unit sends instruction lock frequency and applies saturated light flash pulse, system calculates dynamic apparent electron transfer rate parameter, and according to temperature drift compensation baseline, executes double tolerance threshold comparison determination plant physiological stress state.The application avoids the defect of detection frequency band misplacement, eliminates the interference of strong background light and air temperature fluctuation, realizes the multi-dimensional joint early warning of early physiological stress.

The invention discloses an electrode material which is simple in preparation method, high in performance and capable of stably producing hydrogen by electrolyzing water, and also discloses a preparation method of a photocatalyst for purifying wastewater by using a derivative of the electrode material. The preparation method of the electrocatalyst mainly comprises the following steps: etching a nickel metal substrate by using diluted hydrochloric acid; the preparation method comprises the following steps: preparing a first-stage product, dissolving the first-stage product with a bismuth source and molybdate in a reaction kettle, carrying out hydrothermal synthesis to obtain a hydrothermal product, carrying out high-temperature calcination on the obtained material to obtain a sample precursor and a part of byproducts, finally repeating the reaction once to obtain a high-activity electrode and related byproduct derivatives, mixing the two byproducts, carrying out high-temperature calcination, and grinding to obtain a second-stage product. According to the prepared catalyst, a bismuth source is introduced to serve as an additive, a NiMoO4 / Fe2 (MoO4) 3 composite film layer active phase is constructed on an NF substrate through a one-step hydrothermal-corrosion-growth method, the active phase and an NF framework are induced through a confinement effect to form strong interface bonding, the electron transfer rate is increased, and the electrode performance is remarkably improved by reducing the valence band position of the active phase. The preparation process is simple to operate, the morphology of the catalyst is controllable, and derived by-products generate higher economic benefits.

The invention belongs to the field of metal ion battery material synthesis, and particularly provides a sulfur-doped oxygen-nitrogen-enriched conjugated organic material and application thereof in Li < + > / Zn < 2 + > ion batteries. The preparation method comprises the following steps: firstly, preparing 2, 3, 8, 9, 14, 15-hexachlorodiquinoline [2, 3-a: 2 ', 3'-c] phenazine (HANT-Cl) by taking cyclohexanehexone and dichlorobenzene diamine as raw materials, and then synthesizing 6S6O and the derivative thereof by taking HATN-Cl, sodium sulfide nonahydrate and a naphthoquinone derivative as raw materials. The obtained electrode material contains a plurality of oxidation-reduction active sites, multi-electron storage can be carried out, the transfer rate of electrons is improved through the large pi conjugated structure of the conjugated quinoneazine material, and therefore the high theoretical specific capacity and the excellent rate performance are achieved. Due to the addition of the sulfur element, the oxidation-reduction potential of the material is improved, the energy density of a battery can be improved, and the material has a wide application prospect in a Li < + > / Zn < 2 + > ion battery system.

This invention discloses a molecularly imprinted modified electrode for detecting trifluoroacetic acid in water, its preparation method, and its application. An integrated composite sensing interface is constructed, comprising an enrichment layer, a recognition layer, and a conductive layer, wherein a monolayer Ti3C2T is used. x A three-dimensional conductive network is constructed as the conductive layer, significantly enhancing the electron transfer rate. A molecularly imprinted polymer is used as the conversion layer; its pre-designed specific recognition cavity accurately captures target molecules and converts the specific binding behavior of trifluoroacetic acid into a detectable electrochemical signal. UiO-66-F4 is used as the enrichment layer; leveraging the fluoride-loving interactions between fluorine atoms, trifluoroacetic acid molecules in the water sample are efficiently enriched at the electrode interface, significantly reducing the detection limit to as low as 6.94 ng / L. This molecularly imprinted modified electrode exhibits good selectivity and anti-interference capabilities, along with good repeatability, reducing the detection cost per sample and enabling sensitive and rapid detection of trifluoroacetic acid under complex water conditions.

The invention discloses an enzyme biosensor for rapid detection of organophosphorus pesticide dimethoate as well as preparation and application of the enzyme biosensor, and relates to the field of electrochemical sensors. The method comprises the following steps: preparing GR / GCE, preparing AuNPs / GR / GCE, and preparing AChE / AuNPs / GR / GCE. Graphene and gold nanoparticles are compounded to form AuNPs / GR / GCE, the electrochemical impedance of the glassy carbon electrode is remarkably reduced, the effective specific surface area of the glassy carbon electrode is increased, the electron transfer rate of the surface of the glassy carbon electrode is increased, rich binding sites are provided for immobilization of enzyme molecules, the stability of enzyme is improved, and degradation or inactivation of the enzyme in the using process is reduced; acetylcholine esterase is used as a recognition probe, AChE / AuNPs / GR / GCE is constructed on AuNPs / GR / GCE in a self-assembly mode, dimethoate can prevent acetyl thiocholine iodide from being hydrolyzed to generate thiocholine, electrochemical response signals are reduced, and the dimethoate has good electrochemical response signals, so that the organophosphorus pesticide dimethoate residue is rapidly, accurately and safely screened on site.

The invention provides a silk-screen printing carbon electrode plate and a preparation method thereof, and relates to the technical field of electronic printing. The preparation method of the silk-screen printing carbon electrode plate comprises the following steps: etching at least one micron-sized groove in a working electrode surface area of a carbon electrode plate base material by adopting laser; carrying out plasma activation treatment on the surface with the groove so as to introduce an active functional group while increasing the specific surface area; and then coating the surface of the treated base material with carbon paste through a screen printing technology with optimized parameters to obtain the screen-printed carbon electrode plate. According to the invention, through synergistic modification of the physical morphology and chemical properties of the substrate, the adhesiveness of the carbon paste and the electrochemical active area of the electrode are improved fundamentally, and the electron transfer rate, the reaction sensitivity and the stability of the screen-printed carbon electrode plate are significantly enhanced.

This invention relates to the preparation of a metal-organic framework (MOF) material with confined trimetallic active centers and its catalytic performance in the artificial photosynthesis of urea. A trimetallic synergistic catalytic MOF is provided to address the problem of MOFs' difficulty in photocatalytic urea production. Methods: 1. Preparation of NH2-MIL-125(Ti / Ce); 2. Preparation of Cu-NH2-MIL-125(Ti / Ce). This invention first dopes cerium into NH2-MIL-125(Ti), and then coordinates the amino group of NH2-MIL-125(Ti / Ce) with copper, thereby increasing the electron transfer rate during the photocatalytic process and achieving a high photocatalytic urea yield for Cu-NH2-MIL-125(Ti / Ce). In this invention, the photocatalytic urea yield of Cu-NH2-MIL-125(Ti / Ce) is 400 μg gcat. ‑1 .

The application discloses an amperometric current density stable MoS2 / Ni3S4 / CFP electrocatalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic hydrogen evolution. The application constructs a heterojunction interface between MoS2 and Ni3S4 through a hydrothermal reaction, and MoS2 and Ni3S4 generate a heterojunction on a carbon paper substrate to obtain the amperometric current density stable MoS2 / Ni3S4 / CFP electrocatalyst. The preparation of the composite material comprises the following steps: (1) dissolving nickel salt, urea and ammonium fluoride in water, stirring, and then placing the obtained mixed solution A and carbon paper in a hydrothermal reaction kettle for one-time hydrothermal reaction to obtain a nickel hydroxide precursor; (2) dissolving molybdenum salt and thiourea in water, stirring, and then placing the obtained mixed solution B and the nickel hydroxide precursor in the hydrothermal reaction kettle for two-time hydrothermal reaction to obtain the catalyst. The catalyst improves the electron transfer rate, increases the number of active sites, and exhibits excellent hydrogen evolution reaction activity and stability in the water electrolysis process.

The application provides a tin-gallium co-doped copper oxide-based catalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic reduction of carbon dioxide. First, copper salt, tin salt and gallium salt are dispersed in water, an alkali solution is added dropwise, and then standing is performed to obtain a mixture; then the mixture is sequentially subjected to a hydrothermal reaction, centrifugal separation and drying to obtain the tin-gallium co-doped copper oxide-based catalyst. The tin-gallium co-doped copper oxide-based catalyst prepared by the application has more stable reaction active sites, faster electron transfer rate, more stable performance and higher electrocatalytic carbon dioxide conversion efficiency compared with other copper oxide-based catalysts of the same type.

The application discloses a kind of solubility carbon black electron transfer capacity quantitative prediction method, more than three temperature is selected and is prepared carbon black using biomass, is configured into mixed solution by adding water, mixed solution is cultured by shaker, solution is centrifuged, supernatant is filtered, and solubility carbon black solution is obtained;The concentration of solubility carbon black solution is determined, and the cyclic voltammetry curve of carbon black solution is determined using electrochemical workstation and three electrode system, the peak potential corresponding to each scanning speed in the curve, peak current are obtained, according to scanning rate, peak potential, peak current, solubility carbon black solution concentration, electron transfer rate constant k 0 It is calculated by using Bulter-Volmer equation, linear prediction model is constructed by the logarithmic value of electron transfer rate constant k 0 And pyrolysis temperature, the electron transfer capacity of carbon black at different temperatures is predicted using the model;The method is simple and easy to operate, and the electron transfer capacity of solubility carbon black of known raw material type can be directly predicted.

The invention belongs to the technical field of heavy metal wastewater treatment, and particularly discloses application of a polydopamine modified nano zero-valent iron composite material and dissimilatory iron reducing bacteria in removal of Cr (VI) in wastewater. According to the method, the PDA-nZVI composite material is prepared by using polydopamine modified nano zero-valent iron through a one-pot method, the PDA-nZVI composite material and dissimilatory iron-reducing bacteria form a synergistic system to remove Cr (VI) in wastewater, and through PDA mediation, the problem of agglomeration of nZVI can be solved, the external transmission rate of internal iron core electrons of nZVI is remarkably increased, and the Cr (VI) in the wastewater can be removed. And the electron transfer rate between the dissimilatory iron reducing bacteria and iron oxide in the nZVI surface passivation layer can be improved, the dissolution of the nZVI surface passivation layer is accelerated, and the problem of nZVI surface passivation is effectively solved. The technology for solving nZVI surface passivation provided by the invention has the advantages of high efficiency, low cost, environmental friendliness and the like.

Due to the linear structure of cable-type cells, when a battery cell is fabricated with electrode tabs formed on both ends, the increased battery length increases the distance electrons travel from the electrodes to the electrode tabs, resulting in increased battery resistance and a decrease in the electron transfer rate. To solve this problem, the outermost casing of the cable-type cell is configured so that the external electrodes are exposed from the interior member that constitutes the outermost casing of the cable-type cell, thereby providing the function of electrode tabs without the need for electrode tabs on the external electrodes. This provides a shortest path for electrons to pass from the active material layer of the electrode to the electrode tab, thereby confirming high flexibility and low resistance.

This invention relates to a method for antibiotic removal using struvite as a carrier during phosphorus recovery from biogas slurry, belonging to the field of water pollution control and resource regeneration. The method involves: firstly, recovering nitrogen and phosphorus from biogas slurry using struvite crystallization. The initial pH of the biogas slurry is adjusted to 8.0-10.5, and the mixture is thoroughly stirred. A certain amount of magnesium source is added to initiate the struvite crystallization reaction. Simultaneously, a certain amount of persulfate PMS oxidant is rapidly added, and the reaction pH is adjusted to 8.0-10.5. The mixture is stirred evenly, and the reaction time is controlled at 20-90 minutes, effectively removing antibiotics from the biogas slurry. This invention, while ensuring a high yield of struvite recovery from biogas slurry, accelerates electron transfer rates through struvite crystallization, improving the efficiency of PMS degradation of antibiotics. It provides a simple and effective method to reduce the ecological risks caused by antibiotics during biogas slurry struvite recovery.

The invention belongs to the technical field of photocatalysis, and provides a Fe / LCDs-TCN composite catalyst for removing organic pollutants as well as a preparation method and application thereof.The preparation method comprises the following steps: firstly, preparing carbon nitride TCN by taking melamine and urea as mixed precursors as raw materials; then, TCN is added in the process of preparing CDs and Fe raw material solutions for mixing and heating, the Fe / LCDs-TCN composite photocatalyst is prepared through thermal calcination, and molecular oxygen in air can be efficiently activated to degrade organic pollutants. The Fe / LCDs-TCN composite photocatalyst prepared by the invention has a unique hollow tubular structure, increases active sites, improves the electron transfer rate, has a good energy band structure, not only can activate oxygen to form superoxide free radicals, but also can react with water to generate hydroxyl free radicals and improve the degradation capacity of photocatalysis, does not need additional strong oxidants (PMS and the like), and is suitable for industrial production. An excellent organic pollutant degradation rate can be achieved in a mild air environment and a relatively wide pH range; and the raw materials are low in price, non-toxic and harmless, and excellent in degradation performance, and have very high application value and prospect.

The invention discloses a carbendazim wastewater treatment method, and relates to the technical field of wastewater treatment.The carbendazim wastewater treatment method comprises the following steps that 1, carbendazim wastewater is introduced into a fluidized bed to be sterilized, and bacterium-loaded gel is arranged in the fluidized bed; 2, the carbendazim wastewater treated through the fluidized bed is introduced into a photocatalytic reactor to be subjected to catalytic treatment, a photocatalyst is arranged in the photocatalytic reactor, and a light source is arranged in the photocatalytic reactor; step 3, performing water quality detection on the wastewater treated by the photocatalytic reactor, and discharging the wastewater after the wastewater reaches the standard; the surface of the bacterium-carrying gel introduced into the fluidized bed is subjected to amination modification and then fixes the flora in an electrostatic self-assembly manner, so that the flora density of the surface is improved, the impact resistance of the flora is improved, the flora wastage rate is reduced, the wastewater treatment effect is improved, and the wastewater treatment cost is reduced. And the carboxylated carbon nanotubes construct a three-dimensional conductive network, so that the electron transfer rate is increased, and the dechlorination effect of nitrification-denitrification on wastewater can be promoted.

The invention relates to the technical field of electrochemical sensing, in particular to a platinum-cobalt hydroxide composite material with cobalt vacancy and a preparation method and application thereof. The platinum-cobalt hydroxide composite material with the cobalt vacancies comprises foamed nickel, Pt nanoparticles and cobalt hydroxide, the cobalt hydroxide is deposited on the foamed nickel, the Pt nanoparticles are deposited on the surface of the cobalt hydroxide, and the cobalt vacancies exist in cobalt hydroxide crystal lattices. Wherein the internal electronic structure of the platinum-cobalt hydroxide composite material is changed due to the existence of the cobalt vacancy, the electron transfer rate in the platinum-cobalt hydroxide composite material is increased, and the regulation and control effect of the cobalt vacancy on the electronic structure and the synergistic catalytic effect of a platinum-cobalt hydroxide heterogeneous interface are utilized. When the platinum-cobalt hydroxide composite material with the cobalt vacancy is used as an ammonia nitrogen electrochemical detection sensitive electrode, the catalytic activity of ammoxidation reaction can be remarkably improved, so that a sensor is endowed with the detection performance of low detection limit, high sensitivity, excellent selectivity and good recovery rate.

The application relates to preparation and application of a sandwich type ECL immunosensor of a H2O2 / O2 system for signal amplification by using luminol as a luminophore and a double metal oxide, and belongs to the field of biosensing and novelty combination of new functional materials. A nickel-manganese double metal oxide (NiMnO3@Au-luminol) loaded with luminol luminophore is combined with a gold-modified cobalt-cerium double metal oxide (CoCeOx@Au) to serve as an electrochemiluminescence sensing platform, a sandwich type electrochemiluminescence immunosensor is constructed, and the sensor is used for super-sensitive detection of a non-small cell lung cancer marker CYFRA21-1. The NiMnO3 and CoCeOx materials have great application potential due to simple preparation, suitable acid-base property and multiple valence states of metals. The NiMnO3 can catalyze O2 to generate O2 •− , the CoCeOx can promote H2O2 to decompose to generate •OH, both of the two free radicals can act on Luminol •− to generate a stronger luminescence signal; Au modification on the material surface can significantly improve the electron transfer rate, increase the number of antigen-antibody combination, enhance the ECL signal, and realize sensitive and accurate detection of biomolecules.

The invention discloses a bionic photonic crystal composite material and a preparation method and application thereof, and belongs to the technical field of agricultural functional nanomaterials, the bionic photonic crystal composite material comprises a bionic structure matrix and a light energy conversion unit, the bionic structure matrix is a material with a periodic nanostructure, and the light energy conversion unit is a material with a periodic nanostructure. The lattice constant of the periodic nanostructure is 100-300 nm, so that the periodic nanostructure forms a one-dimensional photonic crystal and has a photonic band gap effect; the light energy conversion unit is modified on the surface of the bionic structure matrix or embedded in the bionic structure matrix, and the light energy conversion unit can absorb wave bands with low utilization rate of crop leaf cuticles and convert the wave bands into wave bands with high utilization rate. According to the bionic photonic crystal composite material disclosed by the invention, the light energy utilization rate and the photosynthetic electron transfer rate (ETR) of crops under weak light are remarkably improved.

Shewanella bacteria are mode electrochemically active bacteria and have bidirectional electron transfer capability, but the reverse electron transfer rate is slower. In order to solve the problem, the invention discloses a method for synchronously constructing an artificial conductive path in shewanella bacteria attachment so as to improve the electron transfer rate of a bacteria-electrode interface and the energy metabolism activity of bacteria. By utilizing the method, after dopamine is subjected to in-situ electropolymerization in the adsorption process of shewanella tamariscina PV-4, polydopamine is formed in a bacterium-electrode interface area, and the current transferred by reverse electrons is improved by 3.46 times. Due to the fact that polydopamine can serve as an artificial conductive path, the reverse electron transfer capacity of shewanella single cells is improved, and the intracellular energy metabolism level is improved through faster electron transfer.

The application relates to an organic liquid flow battery of a Pd-based catalyst modified carbon felt electrode, which comprises a negative electrode, the negative electrode comprising a carbon felt electrode and a Pd-based catalyst loaded on the carbon felt electrode; a negative electrolyte containing fluorescein; a positive electrode comprising a positive electrolyte containing TEMPO; a diaphragm arranged between the negative electrode and the positive electrode, and the diaphragm is a porous diaphragm; and solvents of the negative electrolyte and the positive electrolyte are organic solvents. By loading the Pd-based catalyst (a Pd-Au bimetallic catalyst or a Pd / Au physical mixed catalyst) on the carbon felt electrode, the electron transfer rate of the fluorescein reduction reaction is significantly improved, the redox peak separation degree (DE) is reduced, and the reaction reversibility is improved.

The invention provides an AO process carbon source intelligent adding calculation method, and relates to the technical field of sewage treatment. The method comprises the following steps: S1, collecting operation parameters of an AO process system in real time, S2, calculating a core correction factor based on the operation parameters, and S3, combining the operation parameters and the core correction factor, and obtaining a basic value of the addition amount of an external carbon source through a calculation model constructed by an internal reflux ratio regulation and control formula, an aerobic terminal nitrate nitrogen concentration prediction formula, a target denitrification amount calculation formula and the like; s4, determining a feedback adjustment coefficient, and correcting the basic value of the addition amount of the external carbon source by using the feedback adjustment coefficient to obtain a final addition amount of the external carbon source; s5, judging a microbial metabolism stage according to the microbial extracellular electron transfer rate, executing a corresponding carbon source adding operation based on the metabolism stage, and adjusting an adding strategy in real time through closed-loop monitoring; the effluent total nitrogen standard-reaching rate is improved, the carbon source consumption is reduced, and the long-term operation stability and reliability are improved.

The invention relates to the technical field of immunosensors, and discloses a preparation and detection method of an electrochemical immunosensor based on NiFe-LDO (at) Au / Pd (at) GO bidirectional signal amplification, NiFe-LDO (at) Au and Pd (at) GO are combined to be applied to construction of a double-antibody sandwich type immunosensor, relatively strong electron transfer performance and a unique three-dimensional structure of NiFe-LDO are fully utilized, and the electrochemical immunosensor is prepared. The specific surface area of the electrode is increased, the electron transfer rate is increased, the load rate of Au-coated AB1 is increased, and the capturing capacity of the electrode on ProGRP is improved. Meanwhile, the loading capacity of Pd-Ab2 is promoted, so that a large amount of HPR and Pd are loaded in a detection system, and the catalytic efficiency on H2O2 is improved. The electrochemical immunosensor has the advantages of high sensitivity, wide detection range, good repeatability, good stability and ideal specificity.

The present invention provides a metal-based single-atom catalyst with adjustable site density, a preparation method, and an application thereof. By using an alkaline wet process, utilizing the self-polymerization characteristics of phenolamine polymers under alkaline conditions, and introducing a highly thermally stable carrier, the polymer self-polymerization form is changed, thereby changing the coordination density between metal ions and monomers on the polymer surface, thereby preparing a metal-based single-atom catalyst with adjustable and stable site density. During the pyrolysis process, the introduced carrier, due to its high thermal stability, helps provide a more stable coordination environment for the metal single-atom sites, thereby enabling the obtained metal single-atom catalyst to have a higher site density and stability; while achieving similar catalytic effects, the amount of metal used is reduced; the high active metal site density increases the electron transfer rate and the amount of CO2 adsorbed on the electrode surface, which is beneficial for improving catalytic activity and product yield.

The application discloses a kind of phthalocyanine iron microwire or nanowire microbial fuel cell anode material preparation and its application.Ordered accumulation nanowire or microwire can be in situ growth on the surface of carbon carrier such as carbon cloth, carbon felt, and phthalocyanine iron molecular accumulation spacing 1.6 nanometer.The application can promote the electron transfer between biological-nonbiological interface, improve the electron transfer rate between electricity-producing microorganism and phthalocyanine iron microwire or nanowire;The application can promote the effective enrichment of electricity-producing bacteria Geobacter in sludge, and the abundance ratio in microbial community is 87.5%, effectively improving the proportion of electricity-producing microorganism;The battery anode of the application has excellent biocompatibility, can guarantee the activity of biofilm in the long-term operation process of microbial fuel cell, can enrich electrically active bacteria, improve the long-term activity of biofilm, promote the interface extracellular electron transfer of microorganism, effectively solve the problem that the output power of microbial fuel cell is low and the long-term operation stability is poor.